WO2022205818A1

WO2022205818A1 - Battery module and power-consuming device

Info

Publication number: WO2022205818A1
Application number: PCT/CN2021/121366
Authority: WO
Inventors: 李坤龙
Original assignee: 东莞新能安科技有限公司
Priority date: 2021-03-30
Filing date: 2021-09-28
Publication date: 2022-10-06
Also published as: EP4318790A1; CN113097665A; US20240030539A1

Abstract

A battery module, comprising a case, a cell assembly disposed inside the case, a circuit board, a conductive assembly and a first structural member, wherein the circuit board is electrically connected to the cell assembly; the conductive assembly is electrically connected to the circuit board, and the conductive assembly comprises a first conductive member and a second conductive member; and the first structural member is disposed on the side of the cell assembly that is adjacent to the conductive assembly, and the first structural member is movable in a first direction, such that the first conductive member is connected to or separated from the second conductive member, the first direction being a direction of the cell assembly facing the circuit board. The present invention further relates to a power-consuming device. In the provided battery module, when the cell assembly generates air expansion, the expanded cell assembly pushes the first structural member to move in the first direction, such that the first conductive member is pushed to be connected to or separated from the second conductive member, so as to limit further expansion of the cell assembly.

Description

Battery modules and electrical devices

technical field

The present application relates to the technical field of lithium batteries, and in particular, to a battery module and an electrical device.

Background technique

When the existing soft-packed lithium battery is used for a long time or abnormal conditions occur, the internal cells will produce gas and the phenomenon of cell expansion will occur. When the expansion of the cells reaches a certain level, the cells will explode. If the expansion of the battery cannot be controlled in time, it will lead to a series of safety hazards during the use of the battery.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a battery module and an electrical device that can effectively control the expansion of the battery cells, so as to solve the above-mentioned technical problems.

Embodiments of the present application provide a battery module, including a casing, a cell assembly disposed in the casing, a circuit board, a conductive assembly and a first structural member, the circuit board being electrically connected to the cell assembly ; the conductive component is electrically connected to the circuit board, and the conductive component includes a first conductive member and a second conductive member; the first structural member is arranged on a side of the battery core component adjacent to the conductive component, The first structural member can move along a first direction, so as to connect or separate the first conductive member and the second conductive member, and the first direction is the direction in which the cell assembly faces the circuit board .

In the above-mentioned solution, the first structural member is arranged between the cell assembly and the conductive member, so that when the cell assembly generates gas and expands, the expanded cell assembly pushes the first structural member to move in the first direction, so as to push the first conductive member. The member and the second conductive member are connected or separated to limit further expansion of the cell assembly.

In a possible implementation manner, when viewed along the first direction, the first conductive member and the second conductive member partially overlap.

The above solution partially overlaps the first conductive member and the second conductive member along the first direction, so that when the cell assembly expands and pushes the first structural member to move in the first direction, the first conductive member and the second conductive member can be made to move in the first direction. connect or disconnect.

In a possible implementation manner, the first conductive member includes a first fixing portion, a first connecting portion and a first contact portion arranged in sequence; the first fixing portion is arranged on the circuit board, and the first fixing portion is arranged on the circuit board. A connecting portion is disposed opposite to the first structural member, the second conductive member is provided with a second contact portion, and the first contact portion is connected or separated from the second contact portion. In the above solution, the first connecting portion is arranged relative to the first structural member, so that when the cell assembly expands and drives the first structural member to move in the first direction, the first structural member contacts the first connecting portion and drives the first contacting portion to move along the first direction. The first direction moves to connect or separate the first conductive member and the second conductive member.

In a possible implementation manner, the first connecting portion includes a first portion and a second portion, the first portion is arranged substantially along a horizontal direction, and the second portion is arranged obliquely with respect to the first portion.

In a possible implementation manner, the second conductive member further includes a second fixing portion, the second fixing portion is provided on the circuit board, and the second contact portion is located on the first direction along the first direction. below the contact part and connected with the first contact part.

In a possible implementation manner, the first contact portion and the second contact portion are in contact and connected. The above solution is to fix the second conductive member by fixing the second fixing portion on the circuit board, and connect or separate the first contact portion and the second contact portion under the driving of the first structural member, so as to realize the first conductive member The connection or separation with the second conductive member; the second contact portion is arranged below the first contact portion along the first direction, and the first contact portion is contacted and connected with the second contact portion, so as to be driven by the expansion of the cell assembly When the first structural member moves along the first direction, it can drive the second contact portion to separate from the first contact portion, thereby disconnecting the main circuit of the battery module, so as to relieve further expansion of the battery module.

In a possible implementation manner, the first contact portion and the second contact portion are electrically connected between the positive electrode and the negative electrode of the battery module. When the first contact portion and the second contact portion are disconnected, the positive electrode and the negative electrode of the battery module are disconnected. When the negative pole is disconnected, the battery module stops charging or discharging, and the battery module stops working.

In a possible implementation manner, the first contact portion and the second contact portion are electrically connected to the circuit board, and when the first contact portion and the second contact portion are disconnected, the circuit board controls the input or output current of the battery module, etc., Limit the expansion of the cell assembly, for example, the circuit board controls to disconnect the input or output current of the battery module.

In a possible implementation manner, the second conductive member further includes a second fixing portion, the second fixing portion is provided on the circuit board, and the second contact portion is located on the first direction along the first direction. above the contact portion and separated from the first contact portion.

In the above solution, the second contact portion is separately provided above the first contact portion along the first direction, so that when the cell assembly expands and drives the first structural member to move, the first structural member pushes the first contact portion and the second contact portion. The contact parts are connected to make the first conductive member and the second conductive member conduct, and the management control system detects the conduction current to protect the battery module.

In a possible implementation manner, along the first direction, the first structural member has a first surface close to the cell, and in a natural state, the vertical distance between the first surface and the cell is X1; Along the first direction, the first structural member has a second surface for pushing the first connecting portion, and in a natural state, the vertical distance between the second surface and the first connecting portion is X2; In one direction, the total expansion amount of the cell assembly is X; when X>X1+X2, the expanded cell assembly pushes the first contact portion and the second contact portion to separate.

The above scheme controls the lengths of X1 and X2 to expand the cell assembly to push the first structural member to move in the first direction, and the first structural member pushes the first connecting portion to move so as to separate the first contact portion and the second contact portion. , the main circuit of the battery module is disconnected, and the battery module is still in a safe state, thereby reducing the occurrence of potential safety hazards.

In a possible implementation manner, the circuit board is provided with an opening, and the first contact portion is provided in the opening.

In the above solution, by arranging the first contact portion in the opening, when the first structural member moves in the first direction, it is advantageous to push the first contact portion to connect with the second contact portion.

In a possible implementation manner, the battery module further includes a carrier, the carrier is provided on the housing, and the carrier is located between the battery core assembly and the circuit board, and the carrier is located between the cell assembly and the circuit board. The carrier is provided with a first through hole, and the first through hole is used for passing the first structural member to connect or separate the first conductive member and the second conductive member.

In the above solution, a carrier is arranged between the cell assembly and the circuit board, and the carrier is provided with a first through hole, so that the first structural member is arranged in the first through hole, so as to facilitate the installation of the first structural member .

In a possible implementation manner, the first structural member includes a cantilever portion and an extension portion, the cantilever portion is provided between the carrier and the cell assembly, and the extension portion passes through the first The through hole connects or separates the first conductive member and the second conductive member.

In the above solution, the cantilever portion is arranged in the first through hole between the carrier and the cell assembly, and the extension portion is located in the first through hole, so that when the extension portion moves, it can push the first connecting portion to move and drive the first conductive portion. The member and the second conductive member are connected or separated.

In a possible implementation manner, the first structural member and the bearing member are integrally formed, and the first structural member and the bearing member are integrally formed through an injection molding process.

In a possible implementation manner, the battery module further includes a heat insulating member, an accommodating groove is provided on the side of the first structural member facing the second conductive member, and the heat insulating member is provided in the accommodating member. in the slot.

In the above solution, the heat insulation member is arranged in the accommodating groove to cut off the heat transfer between the second conductive member and the battery core, so as to prevent the heat generated due to the short circuit of the first conductive member and the second conductive member from being transferred to the battery core assembly, In order to reduce the impact of heat transfer on the cell components.

An electrical device includes the above-mentioned battery module.

The battery module of the present application includes a casing, a cell assembly disposed in the casing, a circuit board, a conductive assembly and a first structural member, and the above solution is achieved by arranging the first structural member between the cell assembly and the conductive assembly. , so that when the battery core assembly produces gas and expands, the expanded battery core assembly pushes the first structural member to move in the first direction, so as to push the first conductive member and the second conductive member to connect or separate, thereby disconnecting the main circuit of the battery, to control further expansion of the cell assembly.

Description of drawings

FIG. 1 is a schematic three-dimensional structure diagram of a battery module in an embodiment.

FIG. 2 is a schematic structural diagram of the battery module shown in FIG. 1 attached with a sealing member.

FIG. 3 is a cross-sectional view of the battery module shown in FIG. 2 along the direction I-I.

FIG. 4 is a front view of the seal shown in FIG. 2 .

FIG. 5 is a schematic three-dimensional structure diagram of a battery module in another embodiment.

FIG. 6 is a schematic three-dimensional structural diagram of the conductive component shown in FIG. 5 .

FIG. 7 is a schematic three-dimensional structural diagram of the top support assembly shown in FIG. 1 .

FIG. 8 is a top view of the battery module shown in FIG. 1 .

FIG. 9 is a schematic diagram illustrating when the extension parts shown in FIG. 8 are arranged at different positions.

FIG. 10 is a schematic three-dimensional structure diagram of the battery cell and the buffer member shown in FIG. 1 .

Description of main component symbols

Battery module 100

Shell 10

Heat dissipation area 11

Cooling holes 111

Seals 20

The first sealing area 21

Second Sealing Zone 22

The third sealing area 23

Cell components 30

Cells 31

circuit board 40

The first fixing slot 41

Open 42

The second fixing slot 43

The first mounting hole 44

Conductive components 50

The first conductive member 51

The first fixed part 511

First Contact 512

The first connection part 513

Part One 5131

Part II 5132

The second conductive member 52

Second fixed part 521

Second Contact 522

Top support assembly 60

The first structural member 61

first side 61a

Second side 61b

Cantilever section 611

Extension 612

Receptacle 6121

Bearer 62

The first through hole 621

The second through hole 622

The third through hole 624

The second mounting hole 625

First centerline L1

Second centerline L2

Buffer 70

Heat Insulation 80

first direction A

The second direction A”

Horizontal direction B

The vertical distance between the first side and the cell X1

The vertical distance between the second surface and the first connecting part X2

The total expansion of the cell X

The thickness of the cell assembly along the first direction T

The vertical distance between the center of gravity of the top support and the first center line a

The vertical distance between the center of gravity of the top support and the second center line b

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to another component or there may be an intervening component at the same time. When a component is considered to be "set on" another component, it may be located directly on the other component or may co-exist with an intervening component. The terms "top," "bottom," "top," "bottom," "left," "right," "front," "back," and similar expressions are used herein for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application.

Embodiments of the present application provide a battery module, including a casing, a cell assembly disposed in the casing, a circuit board, a conductive assembly and a first structural member, the circuit board being electrically connected to the cell assembly ; the conductive component is electrically connected to the circuit board, and the conductive component includes a first conductive member and a second conductive member; the first structural member is arranged on the battery core assembly and the battery core component is adjacent to the conductive component On one side of the assembly, the first structural member can move in a first direction to connect or separate the first conductive member and the second conductive member, and the first direction is that the cell assembly faces the the orientation of the circuit board.

In the battery module provided above, the first structural member is arranged between the battery core assembly and the conductive component, so that when the battery core assembly generates gas and expands, the expanded battery core assembly pushes the first structural member to move in the first direction, so that the The first conductive member and the second conductive member are pushed to connect or separate, thereby disconnecting the main circuit of the battery, so as to control the further expansion of the cell assembly.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and features in the embodiments may be combined with each other without conflict.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , an embodiment of the present application provides a battery module 100 , which includes a casing 10 , a battery core assembly 30 disposed in the casing 10 , a circuit board 40 , a conductive assembly 50 and a top The support assembly 60 , further, the top support assembly 60 includes a first structural member 61 . The circuit board 40 is electrically connected to the cell assembly 30 . The conductive component 50 is electrically connected to the circuit board 40 , and the conductive component 50 includes a first conductive member 51 and a second conductive member 52 . The first structural member 61 is disposed on the side of the cell assembly adjacent to the conductive member 50. The first structural member 61, the conductive member 50 and the circuit board 40 are disposed along the first direction A, and the first structural member 61 can be arranged along the first direction A. One direction A moves to connect or separate the first conductive member 51 and the second conductive member 52 , and the first direction A is the direction in which the cell assembly 30 points to the circuit board 40 .

The housing 10 includes a heat dissipation area 11 , and a plurality of heat dissipation holes 111 are provided in the heat dissipation area 11 . In one embodiment, the heat dissipation area 11 is disposed on the side wall of the casing 10 , and the heat dissipation holes 111 communicate with the casing 10 . When the cell assembly 30 generates gas and heat, the generated gas and heat are discharged from the heat dissipation holes 111 on the heat dissipation area 11 , which is beneficial to the heat dissipation of the cell assembly 30 .

The cell assembly 30 further includes a sealing member 20 , which is attached to the heat dissipation area 11 and shields the plurality of heat dissipation holes 111 to restrict other impurities from entering the casing 10 and affect the use of the battery module 100 , such as water. In other embodiments, the battery module 100 further includes an insulating member disposed on the casing 10 , and the insulating member is formed by placing a fluid resin on the casing 10 and then fixing, such as potting glue, and the sealing member 20 blocks heat dissipation The hole 111 is used to reduce the flow of the resin to overflow from the inside of the housing 10 from the heat dissipation hole 111 before curing.

In one embodiment, the sealing member 20 includes but is not limited to a sticker. Preferably, the sealing member 20 has a structure that blocks the heat dissipation hole 111 and can be separated from the housing 10 .

The battery module 100 further includes an adhesive member (not shown), and the sealing member 20 is attached to the heat dissipation area 11 through the adhesive member. In one embodiment, the adhesive member includes, but is not limited to, double-sided tape. Preferably, the adhesive member is a structure with adhesive properties.

Please refer to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the sealing member 20 includes a first sealing area 21 , a second sealing area 22 and a third sealing area 23 , namely the first sealing area 21 , the second sealing area 22 and the first sealing area 22 . The three sealing areas 23 are circumferentially arranged outward in sequence along the center of gravity of the sealing member 20 , and the second sealing area 22 is located between the first sealing area 21 and the third sealing area 23 . On the side facing the housing 10 , the first sealing area 21 and the third sealing area 23 are coated with glued parts, so that when the battery core assembly 30 rapidly generates gas and heat, the generated gas can punch out the uncoated glued parts. In the second sealing area 22 , the gas in the casing 10 overflows out of the casing 10 , thereby reducing the pressure of the casing 10 and reducing safety accidents. In some embodiments, when the compression in the housing 10 is very large, the generated gas will pierce the second sealing area 22 of the uncoated glue, and then pierce the first sealing area 21 and the third sealing area 23, lowering the The pressure of the housing 10.

In one embodiment, the cell assembly 30 includes a plurality of stacked cells 31 , but is not limited thereto. For example, in another embodiment, the cell assembly 30 includes only one cell 31 . Preferably, the plurality of cells 31 are stacked in sequence along the first direction A.

In one embodiment, the circuit board 40 is disposed on the upper end surface of the casing 10 along the first direction A. Preferably, the four corners of the circuit board 40 are provided with first installation holes 44, and the screws pass through the first installation holes 44 to The circuit board 40 is fixed on the casing 10 . It can be understood that the arrangement position of the circuit board 40 is not limited to this. For example, in another embodiment, the circuit board 40 is arranged on the side wall of the casing 10 .

Please refer to FIG. 3 , the first conductive member 51 is electrically connected to the circuit board 40 , and the first conductive member 51 includes a first fixing portion 511 , a first connecting portion 513 and a first contact portion 512 arranged in sequence. Preferably, the first fixing portion 511 The part 511 , the first connecting part 513 and the first contact part 512 are integrally formed. The first fixing portion 511 is fixed on the circuit board 40 . Preferably, the first fixing portion 511 is welded to the circuit board 40 . The first contact portion 512 is used for connecting with the second conductive member 52 . The first connecting portion 513 is disposed between the first fixing portion 511 and the first contact portion 512. Along the first direction A, the first connecting portion 513 is disposed relative to the first structural member 61 to push the cell assembly 30 due to thermal expansion. When the first structural member 61 moves, the first structural member 61 can push the first connecting portion 513 to move, so as to connect or separate the first contact portion 512 and the second conductive member 52 .

In one embodiment, the first connecting portion 513 includes a first portion 5131 and a second portion 5132 , the first portion 5131 is disposed substantially along the horizontal direction B, and the second portion 5132 is disposed obliquely relative to the first portion 5131 . Preferably, the second part 5132 is disposed outside the circuit board 40, and the second part 5132 has elastic force, which can rebound the first part 5131. On the other hand, the second part 5132 can also play a buffering role, restricting the pulling of the first fixing part 511 when the first part 5131 moves upward.

The second conductive member 52 is electrically connected to the circuit board 40 . The second conductive member 52 includes a second fixing portion 521 and a second contact portion 522 . The second fixing portion 521 is disposed at both ends of the second contact portion 522 . The second fixing portion 521 is fixed on the circuit board 40 , and the first structural member 61 can push the first contact portion 512 to contact or separate from the second contact portion 522 .

In one embodiment, the second contact portion 522 is disposed on the side of the circuit board 40 facing the cell assembly 30 , the second contact portion 522 is disposed below the opening 42 , the first contact portion 512 is disposed in the opening 42 and the second The contact portion 522 is connected. In other embodiments, the second contact portion 522 is disposed in the opening 42 to be connected to the first contact portion 512 .

In one embodiment, the circuit board 40 defines a first fixing slot 41 , two second fixing slots 43 and an opening 42 . Preferably, the two second fixing grooves 43 are respectively disposed on opposite sides of the opening 42 , the two second fixing portions 521 are inserted into and fixed in the two second fixing grooves 43 , and the first fixing portion 511 is inserted and fixed in the first fixing groove 41 . Preferably, the first fixing portion 511 is welded to the circuit board 40 . Preferably, the second fixing portion 521 is welded to the circuit board 40 .

Viewed along the second direction A", the first connecting portion 513 and the first contact portion 512 are located in the opening 42. The second direction A" is a direction opposite to the first direction A.

Viewed along the second direction A", the first contact portion 512 and the second contact portion 522 are partially overlapped, so that when the first contact portion 512 moves along the first direction A, the first contact portion 512 and the second contact portion 522 can be mutually connect or disconnect.

In one embodiment, the first conductive member 51 and the second conductive member 52 include, but are not limited to, metal sheets, and may also be other structures that can be in contact with each other and can conduct electricity.

It should be noted that the fixing positions of the first fixing portion 511 and the second fixing portion 521 are not limited to this. For example, in another embodiment, the first fixing portion 511 and the second fixing portion 521 may also be fixed in the casing 10 . other parts, such as the upper bracket.

Referring to FIGS. 2 and 3 , in one embodiment, along the first direction A, the second contact portion 522 is closer to the cell assembly 30 than the first contact portion 512 . When the battery is in a normal state, the first contact portion 512 is in contact with the second contact portion 522 . When the cell assembly 30 heats up and expands, the volume of the cell assembly 30 increases gradually, and pushes the first structural member 61 to move along the first direction A, so that the first structural member 61 pushes up the first conductive member 51 to lift the first conductive member 51 upward. The first contact portion 512 and the second contact portion 522 are disconnected. In some implementations, the first contact portion 512 and the second contact portion 522 are electrically connected between the positive electrode and the negative electrode of the battery module 100 . When the first contact portion 512 and the second contact portion 522 are disconnected, the battery module 100 The positive and negative electrodes of the battery are disconnected, the battery module 100 stops charging or discharging, and the battery module 100 stops working. In some embodiments, the first contact portion 512 and the second contact portion 522 are electrically connected to the circuit board 40 , and when the first contact portion 512 and the second contact portion 522 are disconnected, the circuit board 40 controls the input of the battery module 100 or output current, etc., to limit the expansion of the battery cell assembly 30 , for example, the circuit board 40 controls to disconnect the input or output current of the battery module 100 .

In one embodiment, when the expanded cell assembly 30 returns to a normal state, the first conductive member 51 moves along the second direction A", and the first contact portion 512 is reconnected to the second contact portion 522. At this time, the battery mold The main circuit of the group 100 is connected, and the battery module 100 returns to the normal use state.

In one embodiment, when the first contact portion 512 and the second contact portion 522 are disconnected, the circuit design of the battery module 100 or the design of the circuit board 40 can make the battery module 100 in a damaged state and cannot be restored to normal use. .

In one embodiment, the circuit board 40 is provided with a battery management system component that further controls and manages the voltage, current, etc. of the battery module 100 .

Further, along the first direction A, the first structural member 61 has a first surface 61a close to the cell 31. In a natural state, the cell assembly 30 is not expanded, and the vertical distance between the first surface 61a and the cell 31 is X1. The first structural member 61 has a second surface 61b for pushing the first connecting portion 513. In a natural state, the cell assembly 30 is not expanded, and the vertical distance between the second surface 61b and the first connecting portion 513 is X2; the cell assembly The total expansion amount of the battery 30 is X (not shown); when X>X1+X2, the expanded cell assembly 30 pushes the first contact portion 512 and the second contact portion 522 to separate.

Further, the thickness of the cell assembly 30 along the first direction A is T. In some embodiments, when X/T<10%, the battery is in a normal working state. In some embodiments, when 10%<X/T<20%, the battery cell assembly 30 expands, and at this time, the first contact portion 512 and the second contact portion 522 are in a contact connection state, and the battery is in an expanded but operable state ; In some embodiments, when X/T>20%, the first contact portion 512 is separated from the second contact portion 522, and the battery is in a failed state.

Preferably, the first surface 61a is a plane structure. When the expanded cell assembly 30 is squeezed on the first surface 61a, each part of the cell assembly 30 located at the position of the first surface 61a is uniformly stressed, reducing the amount of battery expansion. The core assembly 30 is punctured by contact with the uneven portion.

Referring to FIG. 5 and FIG. 6 , in another embodiment, along the first direction A, the second contact portion 522 is farther from the cell assembly 30 than the first contact portion 512 . When the battery is in a normal state, the first contact portion 512 Separated from the second contact portion 522 . When the cell assembly 30 heats up and expands, the volume of the cell assembly 30 gradually increases, and pushes the first structural member 61 to move along the first direction A, so that the first structural member 61 pushes up the first conductive member 51 to The first contact portion 512 abuts on the second contact portion 522 . In some implementations, the first contact portion 512 and the second contact portion 522 are electrically connected to the positive electrode, the negative electrode and the circuit board 40 of the battery module 100 . When the first contact portion 512 and the second contact portion 522 are disconnected, the circuit The connection between the board 40 and the positive and negative electrodes of the battery module 100 is disconnected, and the battery module 100 is in a normal use state. In one embodiment, the first contact portion 512 and the second contact portion 522 are electrically connected to the battery management system component. When the first contact portion 512 and the second contact portion 522 are connected, the battery management system component communicates with the circuit board 40 and the battery management system component. In the battery module 100 , the battery management system component detects the short-circuit current, and the battery management system component transmits the short-circuit current information to the circuit board 40 , and the circuit board 40 controls the input or output current of the battery module 100 to limit the expansion of the battery cell assembly 30 For example, the circuit board 40 controls to disconnect the input or output current of the battery module 100 .

In one embodiment, when the expanded cell assembly 30 returns to a normal state, the first conductive member 51 moves along the second direction A", and the first contact portion 512 is separated from the second contact portion 522 again. At this time, the battery mold The pack 100 is disconnected from the battery management system components and the circuit board 40, and the battery module 100 returns to a normal use state.

In one embodiment, when the first contact portion 512 and the second contact portion 522 are connected, the circuit design of the battery module 100 or the design of the circuit board 40 can make the battery module 100 in a damaged state and cannot be restored to normal use.

In another embodiment, the first contact portion 512 and the second contact portion 522 are connected to the positive and negative electrodes of the battery module 100 and a fuse element (not shown), such as a fuse. When the battery management system components are in an abnormal state, the fuses are connected to the positive and negative electrodes of the battery to form a loop, and the circuit is disconnected at the fuses, thereby cutting off the input or output current of the battery module 100, and limiting the battery cell components. 30 expansion.

Please refer to FIG. 3 and FIG. 7 , in one embodiment, the battery module 100 includes a carrier 62 , and the carrier 62 is fixed on the housing 10 . Preferably, the carrier 62 is located between the cell assembly 30 and the circuit board 40 . . Preferably, the carrier 62 is provided with a first through hole 621 corresponding to the opening 42 .

In one embodiment, the four corners of the carrier 62 are provided with second mounting holes 625 , and screws pass through the second mounting holes 625 to fix the carrier 62 on the housing 10 . It can be understood that the fixing method of the carrier 62 is not limited to this. For example, in another embodiment, the carrier 62 is welded or integrally formed on the housing 10 . In one embodiment, the carrier 62 includes, but is not limited to, a carrier plate. Preferably, the carrier 62 is a structure that can be disposed in the housing 10 and can support the first structural element 61 .

In one embodiment, the first structural member 61 is disposed on the carrier member 62 . Preferably, the first structural member 61 is disposed on the side of the carrier member 62 facing the cell assembly 30 . Preferably, the first structural member 61 is detachably fixed to the bearing member 62, such as through bolts. Preferably, the first structural member 61 and the carrier member 62 are integrally formed, such as by an injection molding process. The first structural member 61 is connected to the first contact part 512 through the opening 42 and the first through hole 621 so that the first contact part 512 and the second contact part 522 are connected or disconnected.

In one embodiment, one end of the first structural member 61 is connected to the carrier member 62 , the first structural member 61 includes a cantilever portion 611 and an extension portion 612 , the extension portion 612 is connected to one end of the cantilever portion 611 , the cantilever portion 611 and the carrier member 62 is separated, the extension part 612 and the carrier 62 are separated, which facilitates the movement of the cantilever part 611 and the extension part 612 in the first direction. Preferably, the cantilever portion 611 is inclined relative to the second direction, and one end of the cantilever portion 611 faces the cell assembly 30 . The extension portion 612 is disposed along the first direction from one end of the cantilever portion 611 . Preferably, the cantilever portion 611 has a certain elasticity, and under the rebound of the cantilever portion 611, the cantilever portion 611 moves along the second direction A″, further driving the extension portion 612, so that the first contact portion 512 and the second contact portion 522 connect or disconnect.

In one embodiment, the first structural member 61 is at least partially disposed in the first through hole 621 , the first through hole carrier 62 defines a second through hole 622 , and the second through hole 622 is located beside the first through hole 621 and is parallel to the first through hole 621 . Corresponding to the first fixing groove 41 , the end of the first fixing portion 511 can extend into the second through hole 622 to reduce interference between the first fixing portion 511 and the carrier 62 during installation.

The carrier 62 is also provided with positioning grooves (not shown), and the positioning grooves are symmetrically arranged on opposite sides of the first through hole 621 , so that when the second conductive member 52 is installed, the second contact portion 522 can be placed in the positioning groove first. Inside, it is beneficial to precisely position the second conductive member 52 .

The carrier 62 also defines a third through hole 624 . Viewed from the third direction, the third through hole 624 is located outside the circuit board 40 , so that the wire harness in the housing 10 can be drawn out from the third through hole 624 .

In one embodiment, the cantilever portion 611 and the extension portion 612 are made of a material capable of elastic deformation, such as elastic plastic. When the cell assembly 30 returns to the normal state from the expanded state, the cantilever portion 611 and the extension portion 612 can be restored to the original state and are located in the first through hole 621 , so that the battery module 100 can still be used normally after the abnormal expansion disappears.

Referring to FIG. 8 , in one embodiment, the battery cell includes an accommodating portion (not shown) and an electrode terminal (not shown) disposed outside the accommodating portion. The accommodating portion is used for accommodating the electrode assembly, and the accommodating portion is approximately For the rectangular structure, when viewed along the first direction A, the extension portion 612 is approximately disposed at the center of the accommodating portion, so as to more accurately detect the expansion of the battery assembly.

In one embodiment, viewed along the first direction A, the extending portion 612 is disposed at other positions of the accommodating portion, please refer to FIG. 9 , the carrier 62 is a rectangular plate, and each two opposite sides of the carrier 62 respectively have a first centerline L1 and the second center line L2, the vertical distance between the center of gravity of the extension part 612 and the first center line L1 is a, and the vertical distance between the center of gravity of the extension part 612 and the second center line L2 is b, and the extension part 612 is provided at a and b Junction.

Please refer to FIG. 10 , the battery module 100 further includes a buffer member 70 . The buffer member 70 is disposed between each two cells 31 to buffer the pressing force between the two cells 31 when the cells 31 are heated and expanded. , reducing the damage rate of the two cells 31 when they expand.

In one embodiment, the buffer member 70 includes, but is not limited to, foam. Preferably, the buffer member is an elastically deformable structure.

In one embodiment, the battery module 100 further includes a heat insulating member 80 , a side surface of the first structural member 61 facing the second conductive member 52 is provided with an accommodating groove 6121 , and the heat insulating member 80 is disposed in the accommodating groove 6121 to Limit the heat transfer between the second conductive member 52 and the cell 31, and limit the heat generated when the first conductive member 51 and the second conductive member 52 are connected to transfer to the cell assembly 30, so as to reduce the heat transfer to the cell assembly 30. Impact.

In one embodiment, the heat insulating member 80 includes, but is not limited to, a mica sheet. Preferably, the heat insulating member 80 is a structure with a heat insulating function.

In one embodiment, when the expansion amount of the plurality of cells 31 is less than 10%, the plurality of cells 31 squeeze the foam. At this time, the appearance of the battery module 100 has no obvious change.

When the expansion amount of the plurality of battery cells 31 is between 10% and 20%, the appearance of the battery module 100 is expanded. At this time, the plurality of cells 31 contact the first surface 61a on the extension portion 612 and push the extension portion 612 to move along the first direction A, but the extension portion 612 does not push the first contact portion 512 and the second contact portion 522 Separated, the battery is in normal use.

When the thermal expansion of the plurality of cells 31 is greater than 20%, the extension portion 612 moves along the first direction A and pushes the first contact portion 512 and the second contact portion 522 to separate, and the main circuit of the battery module 100 is disconnected. When the abnormal expansion of the battery module 100 disappears, the first contact portion 512 returns to its original state under its elasticity and contacts with the second contact portion 522, thereby connecting the main circuit of the battery module 100, and the battery module 100 resumes normal operation. state.

In the battery module 100 provided above, by disposing the first structural member 61 between the cell assembly 30 and the conductive member 50, when the cell assembly 30 expands, the expanded cell assembly 30 pushes the first structural member 61 along the first structural member 61. Move in one direction A to push the first conductive member 51 and the second conductive member 52 to connect or separate, so as to limit the use of the battery pack and control the further expansion of the cell assembly 30 .

In addition, those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present application, not to limit the present application. Appropriate modifications and variations are within the scope of this disclosure.

Claims

A battery module, comprising a casing and a battery core assembly arranged in the casing, characterized in that the battery module further comprises:

a circuit board, electrically connected to the battery core assembly;

a conductive component electrically connected to the circuit board, the conductive component includes a first conductive member and a second conductive member;

a first structural member, disposed on a side of the cell assembly adjacent to the conductive member, the first structural member can move along a first direction, so that the first conductive member is connected to the second conductive member Alternatively, the first direction is the direction in which the cell assembly faces the circuit board.
The battery module of claim 1, wherein when viewed along the first direction, the first conductive member and the second conductive member partially overlap.
The battery module of claim 1, wherein the first conductive member comprises a first fixing portion, a first connecting portion and a first contact portion arranged in sequence;

The first fixing portion is arranged on the circuit board, the first connecting portion is arranged opposite to the first structural member, the second conductive member is arranged with a second contact portion, and the first contact portion is connected to the first contact portion. The second contacts are connected or disconnected.
The battery module of claim 3, wherein the second conductive member further comprises a second fixing portion, the second fixing portion is arranged on the circuit board, and along the first direction, the second fixing portion is The contact portion is located below the first contact portion and is connected to the first contact portion.
The battery module of claim 3, wherein the second conductive member further comprises a second fixing portion, the second fixing portion is arranged on the circuit board, and along the first direction, the second fixing portion is The contact portion is located above the first contact portion and is separated from the first contact portion.
The battery module according to any one of claims 3 or 4, wherein,

along the first direction, the first structural member has a first surface close to the cell assembly, and in a natural state, the vertical distance between the first surface and the cell is X1;

along the first direction, the first structural member has a second surface for pushing the first connecting portion, and in a natural state, the vertical distance between the second surface and the first connecting portion is X2;

along the first direction, the total expansion amount of the cell assembly is X;

When X>X1+X2, the expanded cell assembly pushes the first structural member to move so that the first contact portion and the second contact portion are separated.
The battery module of claim 3, wherein the circuit board is provided with an opening, and the first contact portion is provided in the opening.
The battery module according to claim 3, wherein the battery module further comprises a bearing member, the bearing member is arranged on the casing, and the bearing member is located between the cell assembly and the Between the circuit boards, the carrier is provided with a first through hole, and the first through hole is used for passing the first contact part through so that the first conductive member and the second conductive member are connected or separation.
The battery module according to claim 8, wherein the first structural member comprises a cantilever portion and an extension portion, the cantilever portion is provided between the carrier and the cell assembly, and the extension portion A portion passes through the first through hole so that the first conductive member and the second conductive member are connected or separated.
The battery module according to claim 1, wherein the battery module further comprises a heat insulating member, a side surface of the first structural member facing the second conductive member is provided with an accommodating groove, and the insulating member is provided with an accommodating groove. The heat element is arranged in the accommodating groove.
An electrical device, characterized by comprising the battery module according to any one of claims 1 to 10.